* {
    margin: 0;
    padding: 0;
    list-style: none;
}
.box {
    width: 100%;
    height: 320px;
    background: red;
}
.screen {
    position: relative;
    height: 100%;
    overflow: hidden;
}
.screen .indicators {
    position: absolute;
    left: 50%;
    bottom: 20px;
    z-index: 2020;
    display: none;
}
.screen .indicators li {
    float: left;
    width: 10px;height: 10px;
    margin: 0 2px 0;
    border-radius: 50%;
    background: #999;
    cursor: pointer;
}

.screen .indicators li.active {
    background: #fff;
}
.screen .inner {
    position: absolute;
    left: 0;
}
.screen .inner,
.screen .inner .item
{
    width: 100%;height: 100%;
    overflow: hidden;
}
.screen .inner .item {
    float: left;
}

.screen .inner .item img {
    width: 100%;
}
.screen .control-prev,
.screen .control-next 
{
    position: absolute;
    top: 50%;
    z-index: 2020;
    width: 34px;
    height: 20px;
    padding: 10px 0;
    text-align: center;
    margin: -20px 0 0 0;
    opacity: .2;
    border-radius: 4px;
    background: #000;
    display: none;
}
.screen .control-btn:hover {
    opacity: .4;
}
.screen .control-btn .icon-box {
    display: block;
    width: 100%;height: 100%;
    background: pink;
}
.screen .control-prev {
    left: 50px;
}
.screen .control-next {
    right: 50px;
}
.screen .control-btn .icon-box.prev-icon-box {
    background: url() no-repeat center center;
}
.screen .control-btn .icon-box.next-icon-box {
    background: url() no-repeat center center;
}